Just a heads up to everyone that all penrite oil is on sale. 

Sale ends 11/4 so put in your click and collect asap.

Good time to service your outboard with this covid drama.

I did a bit of research and the 10w-40 engine oil is certified to nmma fc-w which is what you want (corrosion tested).

Also the gear oil is full synthetic and marine specific so it sounds pretty good to me.